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Why is it that SDF bothered to seal the swamp? or for what did they administered the shots at the day of the disaster?

Spoiler for Spoiler about syndrome:

They sealed the swamp because that's where it lives. The thing about every infectious agent that you have to ask yourself is, "What's the vector?". There's no human to human transmission because the syndrome isn't spreading beyond Hinamazawa. The primary infection reservoir could be an animal native to the area but they never showed any encounters between Keiichi and local animal life. The source of the contagion is probably the swamp water itself. As water from the swamp seeps into the local groundwater, it carries with it a microorganism that contaminates the water supply for the town. The microorganism has very particular tastes in environment though so the degree to which it can spread is limited. Destroy its environment and you wipe out all but the colony living inside Rena which will die when she does. Ooishi and the other visitors to the area were never infected because they didn't drink the water.

They sealed the swamp because that's where it lives. The thing about every infectious agent that you have to ask yourself is, "What's the vector?". There's no human to human transmission because the syndrome isn't spreading beyond Hinamazawa. The primary infection reservoir could be an animal native to the area but they never showed any enounters between Keiichi and local animal life. The source of the contagion is probably the swamp water itself. As water from the swamp seeps into the local groundwater, it carries with it a microorganism that contaminates the water supply for the town. The microorganism has very particular tastes in environment though so the degree to which it can spread is limited. Destroy its environment and you wipe out all but the colony living inside Rena which will die when she does. Ooishi and the other visitors to the area were never infected because they didn't drink the water.

Other citizens did get weird from time to time in the past as they underwent stress. Like the... er... is that getting into game spoilers?

I think anything from the first season is ok (as long as IT was in the show^^) anything else keep in spoilers^^

As for your theory^^

Spoiler for Your theory^^:

Its interesting but somethings are missing. The kids life pretty happy lives so where is this stress coming from? Also ceiling the swamp with cement isn't a 100% sure thing to lock in the water/gas. It cracks over time plus water can seep through it so therefore the town will be affected once again. And what about the mass death on that set date^^ How is that related to the water? Theres also the deal with Rika and her uniqe situation. How does she fit in?

The question I was responding to was concerning what happened to the swamp. For the purposes of that question, whether or not the theory about the cause of the psychotic behaviour is true or not, (or complete or not) is irrelevant. All that matters is what the government believes to be true. Clearly the government does not believe the "volcanic gas" story because if it did, there would be no reason to keep the area under quarantine for some twenty years. Volcanic gas doesn't hang around. Therefore the gas story is...ah...a smokescreen, yes? The government believes that there was a disease and that is why they destroyed the swamp.

Reunion was based on the Devil's [whatyoumacallit], the final TIPS of Tsumihoroboshi. The difference from that TIPS and Reunion was that Rena lived. That was necessary to get in the Rena/Rika scene in the Junkyard.

Reunion was based on the Devil's [whatyoumacallit], the final TIPS of Tsumihoroboshi. The difference from that TIPS and Reunion was that Rena lived. That was necessary to get in the Rena/Rika scene in the Junkyard.

So reunion is just a alternate version of an answer arc that they did to the second series of the anime right?

Yes ooshi comfirms that in 18:36 when he says that telling all that rena knows is all she can do to let rika furude,sonozaki shion/mion(though he says sonozaki in singular but i guess he means both of them anyway),satoko hojou and maebara keiichi rest in peace.

what tipped them over the edge^^. I'll agree those would be stressful, but they didn't become raging murderes/crazy untill after a certain scene/meeting/event. Yes Rena KO'd daddies bit... i mean girlfriend but she had relaxed a little afterwards (thanks to friends) until ... Shion loved Satoshi but she didn't suspect foul-play until ..... Keiichi didn't think his friends were murders until things started pointing in that direction .... Satoko in my opinion never went truly crazy she was just supject to bad circumstances. She never started pointing fingers for Satoshi's killer or plan out murders. In that arc I'd say it was more Keiichi then Satoko. So what made them think the way they did and why is it important?

let's just say that every "madness" occurance are somewhat fishy to begin with.
of course, each of them has a different origin, but i think all of you know there might be something behind it, since in every arc (except of course himatsubushi), there is a madness case.

that said, it might be related with reunion information, but it is kinda not enough to set a theory into stone.

I think anything from the first season is ok (as long as IT was in the show^^) anything else keep in spoilers^^

Just to elaborate on this - as stated in the thread guidelines, there must be no spoilers in the weekly episode discussion threads. Even with properly used spoiler tags they are not allowed. Posts containing spoilers (tagged or otherwise) are going to get deleted and might earn you a temporary ban. These threads are supposed to be safe-haven for anime only watchers.

Just to elaborate on this - as stated in the thread guidelines, there must be no spoilers in the weekly episode discussion threads. Even with properly used spoiler tags they are not allowed. Posts containing spoilers (tagged or otherwise) are going to get deleted and might earn you a temporary ban. These threads are supposed to be safe-haven for anime only watchers.

Thanks for the insight^^ So keeping stuff related to first season (spoiler like anyway) to the other threads is best then, and keep stuff related to just whats in the current ep is prefered^^ understood lol. Gonna be hard not to spill just the little hints but I'll do my best lol

yes more like this.
most likely, the guidelines prevent people to blurt the truth and various events of the future.

speculations and theories are welcome, especially if they are also based on hints of the first season.
and anyway, one must be crazy to go on season 2 without getting through season 1 beforehand.
but remember : speculations and theories aren't spoilers per se.
of course, spoilers are solely from future events, since past events will hardly spoil the rest.

so, involving season 1 is fine (i think), and this will strengthen theories.

as for the deal with Season 1 vs season, season 2 should indeed be covered in weekly episodes and general discussion thread.